15 minutes SMS door entry alarm

hi guys this is my first instructable i hope you'll enjoy it !!

Got sick of the high prices of Home Security systems ??
have old mobile sets don't know what to do with ?
build a cheap alarm system that will notify you on your mobile by SMS.
ready ??

grab the tools !

Step 1: What you'll need

An old mobile phone set with supply (charger).
Cheap door magnetic alarm (can be replaced by a magnetic switch and a magnet ).
5 volts Relay.
Soldering iron.
wires and thin insulated copper wires.
micro driller.
micro screwdriver set.
clipper.
multimeter.
Scotch tape.

Comments

[Mahmoud Alaa]

hey i am Egyptian too i am very glad that Egyptian people in instructables

[Ayman_Alqdah]

مشكووووووووووووووووووور اخوي على هل المشروع الاكثر من رائع وانا بحيك من الاردن وان شاء الله للامام ونشوف اشي جديد

[نعبدالرحمن]

MSA ya Mostafa keep on, and I'm sure that someday you will be a great inventor ;). Bas sa3tha mtt3allish 3alina :DD

[miffy1297]

Hi Am I missing something , Once the switch is made , does this not mean that the send button is effectively on all the time. I am thinking of using the system on my old boat , to warn of water ingress , but the switch would make once only , whereas you really want a pulse to operate the phone.
any ideas.
Miffy

[PanadoL]

Hi,
No once the message is sent "in most mobiles " it wont be sent again
you have to "re-trigger" the switch to send the SMS again,
for your application you can also make a very simple digital circuit to send one pulse and stops working,on this way you wont need to "re-trigger" the system to make it work again.
cheers

[miffy1297]

Hi
Many thanks will rig up a circuit and try this.

[waddellm]

Hi Miffy,

I am wondering if you ever got this to work for your old boat. I arrived at the same instructable because I am trying to do the exact same thing to warn me if the bilge pump is running, or if the water level gets too high on my vintage boat.

Any help you can offer would be great!

thanks,

[miffy1297]

Hi waddellm

Yes I have had this system working on my boat for the last two years. The only problem I had was keeping the phone battery charged . as I can leave the boat for several months over the winter, All I did was connect the bilge switch do the phone contacts , unfortunatly it was never tested as I have not had a leak.
Best wishes Andy

[miffy1297]

Hi
Has anyone managed to connect wires to the light or sounder on a phone in order to switch anything on via a phone, any ideas.

[roland985]

Oooh, Oooh, I know. A BOMB!!!

[PanadoL]

wooops....got me... :o

[PanadoL]

Yup...I've tried 2 ways, use a photo-resistor with circuit on the phone's display
and put them in a sealed box, when the phone receives a call its display will emit light, this light will operate the circuit. VERY SIMPLE
another way which I've tried but it's more complicated , is by using DTMF receiver circuit through phone's headset and controlling 10 relays through the caller's phone keypad.
for sharing any ideas or help with related projects, please contact me on my e-mail : [e-mail]

[TheBestJohn]

you could also arduino this to send an email to your cellphone... It would cost less than having a whole other phone's bill. As far as I know any cellphone provider gives their phone numbers email addresses.

[JamesRPatrick]

I think a prepaid phone would be even cheaper.

[miffy1297]

Thanks a lot , i had wondered whether this would work , I had tried connecting to the vibrator in the phone but this proved too tricky,

[manutea]

Nice instructables, I love its simplicity!
thanX 4 sharing this project

[timotb]

I love the High School Ingenuity. (Yes, that is a compliment.)  .  If you guys  can get together and build a simple refined device that will use the cellular system to send a SMS alarm message, like what we see here only with refinement.....let me know.....there is a market for a cheap alarm notifier..

[jules15]

PanadoL, where did you get those special tools to open the phone case?

[hunterbait93]

 instead of doing the weird stuff with the magnetic switch, just set it on the door frame and put a magnet into the door so it passes, duh

[jules15]

i tried that last year and the relay is much easier

[aussa]

Nicely done, I would recommend adding the wires to number button and adding your number to a speed dial assigned to that specific button. I made a similar thing in my car. But is triggered by the car alarm system ( in case I am away and cant hear the alarm)

[hunterbait93]

 maybe you could make an electromagnet with a concealed switch outside the door so you can turn it on and off

[TechXhacker]

You do not need the alarm to send the message. Simply remove the small green, which is the magnetic sensor, and paste on the side of the phone. The magnet will be laid at the door, and when someone opens the OK button is pressed. Only has the disadvantage that when placed in the door can only be disabled after entering the house, which creates a cost (it's expensive!). A tip: put a switch activated by key on the outside wall, using an existing passage (a conduit, for example).
Or, you can think big, and put a remote control, connected to a relay! (Not so expensive, and it is sold ready for use). But the idea was good. I had thought about it but thought it would not work.

[sulphurissweet]

can u help me with where to connect the wires. that is which wire to which terminal of the relay

[ibuildcrap]

This is cool but it will only work ONCE after the door is opened which will make it send the message. A much more reliable method would be to connect an arduino to the magnetic switch and make a simple program to send the computer a number if the switch is opened over the usb cable. On the computer side you could pick from a bunch of different languages like vb.net, arduino ect... But what you would do is write a program on the computer that listens on the usb (serial port) and if it reads the specific number from the arduino like 2 for door open then it would send an email BUT when you send the email it would be yourphonenumber@yourcarriersemail2text for example [e-mail] <-- this will send a text message to that number if it is a VERIZON wireless phone most carriers have this email to text service, just look up your exact carriers.

[PanadoL]

Nice.. I was having many options but I was just looking for THE SIMPLICITY and something that any one can build easily with out knowing almost any thing about electronics or programming, I worked with Parallel port before and I made a remote control via the telephone line fax modem to send DTMF to a mobile phone during the call, the DTMF is received from the headphones to a DTMF decoder then to a BCD to decimal decoder then to the 10 relays set using visual basic was very easy and reliable for this application , If anyone need help with building a project like this or upgrading this project just contact me... Regards to all

[lightsyoung]

can you plz. give us a complete procedure  on constructing the same project especially on connecting the wire into the send button? we are looking forward to ur reply the soonest. thank you.

[wjames]

this is my 5v relay so if my alarm is normally open/close in which pin will i connect my wires?..and which pin will i use so that the relay will have power??:)

[wjames]

is this the logic diagram?

[knightz]

we dont have common terminal.....is it ok????

[PanadoL]

I assume that you have 4 terminals , 2 for the coil and the other 2 are probably NO. "as they are more popular" but to make sure, test the two connection terminals with multimeter if they were connected so it's NC and it'll work, if not then it's NO and It won't work . you need a relay with NC terminal even if it doesn't have a common terminal "NC-SPST" type. you can find relays at the nearest components store.

[LittleHairyApe]

Maybe I'm missing something. How do you set the alarm? If you set up the phone as described and open the door to go to work, that will trigger the alarm, right? Then aren't you screwed? Since the alarm is a one-shot deal, then you're done right? No more alarm...Puzzled.

[PanadoL]

No.. most of mobile phones when you press send and release It's just go back again to the send mode... but this will make you receive an SMS every time you go out of the door... as I received many comments about this issue we suggested that you can just make it on a speed dial key to call you when the door is opened "instead of sending SMS" and of course that's better idea another thing that you can also answer the phone to hear what's going on... feel free to read the comments about the topic specially Macobt's comments regards

[agis68]

why not use the relays contacts connected to a 555 reset timer circuit, so now you can adjust the reaction period and the durance of the alarm signal

[LittleHairyApe]

Ok, thanks for your time. Cheers.

[scoobbrandon]

i have a suggestion have a speed diel to your phone and hook a loud speaker to the phone in the alarm so when they open the door it calls your phone ant you can talk over the loud speaker

[wjames]

how will you know if the magnetic switch is NC or NO using an analogue multimeter??

[PanadoL]

This is very simple : switch the multimeter to ohm mode , then check the switch " without putting the magnet " , if NC your multimeter will read near 0 ohms,"the needle will move to the other direction" if NO it'll read infinity that means the needle won't move ! cheers : )

[stevescam001]

This idea is BOSS!

[x133tx0n3x]

How about the you set it up to dial "your phone number" and just don't press send, then, on your mobile phone, make a new contact with the number of the old phone as "Door #1" and so on. Then when the door is open, it dials your phone number and you can hear whats going on. Wow I did a bod job of explaining that. Hope you understand